taggedTuple.cpp

#include <iostream>
#include <brigand/brigand.hpp>

template<typename Members>
class TaggedTuple{

	template<typename TagType>
	struct createMember{
		using type = typename TagType::type;
	};

	using DataTuple = brigand::transform<Members, createMember<brigand::_1>>;
	brigand::as_tuple<DataTuple> members;

public:

	template<typename TagType>
	auto& get(){
		using index = brigand::index_of<Members, TagType>;
		return std::get<index::value>(members);
	}
};

int main(){

	struct FloatTag{
		using type = float;
	};
	struct IntTag{
		using type = int;
	};
	struct DoubleTag{
		using type = float;
	};

	TaggedTuple<brigand::list<FloatTag, IntTag, DoubleTag>> tagged;

	tagged.get<DoubleTag>() = 200;
	auto val = tagged.get<DoubleTag>();
	std::cout << val << std::endl;

	return 0;
}